* tests/gpgscm/init.scm (vm-history-print): New function.
* tests/gpgscm/opdefines.h: New opcodes 'CALLSTACK_POP', 'APPLY_CODE',
and 'VM_HISTORY'.
* tests/gpgscm/scheme-private.h (struct history): New definition.
(struct scheme): New field 'history'.
* tests/gpgscm/scheme.c (gc): Mark objects in the history.
(history_free): New function.
(history_init): Likewise.
(history_mark): Likewise.
(add_mod): New macro.
(sub_mod): Likewise.
(tailstack_clear): New function.
(callstack_pop): Likewise.
(callstack_push): Likewise.
(tailstack_push): Likewise.
(tailstack_flatten): Likewise.
(callstack_flatten): Likewise.
(history_flatten): Likewise.
(opexe_0): New variable 'callsite', keep track of the expression if it
is a call, implement the new opcodes, record function applications in
the history.
(opexe_6): Implement new opcode.
(scheme_init_custom_alloc): Initialize history.
(scheme_deinit): Free history.
* tests/gpgscm/scheme.h (USE_HISTORY): New macro.
--
This patch makes TinySCHEME keep a history of function calls. This
history can be used to produce helpful error messages. The history
data structure is inspired by MIT/GNU Scheme.
Signed-off-by: Justus Winter <justus@g10code.com>
fu history
* tests/gpgscm/opdefines.h: Add opcodes to create and retrieve tags.
* tests/gpgscm/scheme.c (T_TAGGED): New macro.
(mk_tagged_value): New function.
(has_tag): Likewise.
(get_tag): Likewise.
(mark): Mark tag.
(opexe_4): Implement new opcodes.
* tests/gpgscm/scheme.h (USE_TAGS): New macro.
--
Tags are similar to property lists, but property lists can only be
attached to symbols. Tags can not be attached to an existing object,
but a tagged copy can be created. Once done, the tag can be
manipulated in constant time.
Using this during parsing will enable us to produce meaningful error
messages.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/opdefines.h (put, get): Check arguments. Also rename
to 'set-symbol-property' and 'symbol-property', the names used by
Guile, because put and get are too unspecific.
* tests/gpgscm/scheme.c (hasprop): Only symbols have property lists.
(get_property): New function.
(set_property): Likewise.
(opexe_4): Use the new functions.
Signed-off-by: Justus Winter <justus@g10code.com>
